"220V Cooling Fan" is a DC voltage and electromagnetic induction, the electrical energy into mechanical rotation so as to drive the blades. DC fan wheel and blade design, with the wind and air pressure and DC fan blades collide compression capability is closely related to a serious point that affects the whole "220V Cooling Fan" grade and quality, how to design efficient and simple process of DC fans The main problem has been the researchers studied, the design efficiency impeller blades is the main way to solve this problem. Through these contents, we regard "220V Cooling Fan" works should have a better understanding of familiar with it!